CN112903826A - Ultrasonic detection method for fillet weld of placed tube seat of nuclear power station - Google Patents
Ultrasonic detection method for fillet weld of placed tube seat of nuclear power station Download PDFInfo
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- CN112903826A CN112903826A CN202110048497.4A CN202110048497A CN112903826A CN 112903826 A CN112903826 A CN 112903826A CN 202110048497 A CN202110048497 A CN 202110048497A CN 112903826 A CN112903826 A CN 112903826A
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- 238000000034 method Methods 0.000 claims abstract description 42
- 238000004088 simulation Methods 0.000 claims abstract description 39
- 238000003466 welding Methods 0.000 claims abstract description 27
- 239000006249 magnetic particle Substances 0.000 claims description 13
- 230000004927 fusion Effects 0.000 claims description 12
- 238000000547 structure data Methods 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 11
- 238000009792 diffusion process Methods 0.000 claims description 11
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
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Abstract
The invention relates to the technical field of nuclear power station detection, in particular to an ultrasonic detection method for fillet welds of a tube seat of a nuclear power station. The method comprises the following steps: preparing a first reference block and a second reference block for placing a fillet weld of a tube seat; carrying out ultrasonic detection simulation on the first comparison test block through a 35-degree probe and a 45-degree probe, and recording first detection data; carrying out ultrasonic detection simulation on the second comparison test block through a 35-degree probe and a 45-degree probe, and recording second detection data; generating a welding line detection procedure according to the first detection data and the second detection data; and controlling the 35-degree probe and the 45-degree probe to carry out ultrasonic detection on the fillet weld of the placed tube seat according to the weld detection procedure and obtaining an ultrasonic detection result. The combination of the 35-degree probe and the 45-degree probe ensures that a larger unreachable area does not exist in the ultrasonic detection process of the fillet weld of the placed tube seat any more, and the finally obtained ultrasonic detection result has high precision, thereby effectively ensuring the safety performance of equipment of an in-service nuclear power station.
Description
Technical Field
The invention relates to the technical field of nuclear power station detection, in particular to an ultrasonic detection method for fillet welds of a tube seat of a nuclear power station.
Background
In nuclear power plants, it is important for equipment to be in-service checked to determine the safety performance of the in-service equipment. At present, in the in-service inspection process of a nuclear power station, a standard ultrasonic detection method does not exist for a fillet weld of a placed full penetration tube seat, particularly a nozzle weld at the connecting position of an auxiliary water supply system (ASG) pipeline and a main water supply system (ARE) pipeline of the nuclear power station; in the prior art, the nozzle welding seam at the connecting position is detected by an ultrasonic detection method aiming at other equipment, so that an unreachable area which cannot completely cover the whole welding seam thickness range exists in the detection process, and the unreachable area is often larger; therefore, signals of the artificial reflector obtained in the detection process are difficult to distinguish, and strong structural signals also exist; the above-mentioned problems may affect the detection result, resulting in inaccurate final ultrasonic detection result, which may affect the safety performance of the device.
Disclosure of Invention
The embodiment of the invention provides an ultrasonic detection method for fillet welds of a tube seat of a nuclear power station, which solves the problems that an unreachable area which cannot completely cover the whole weld thickness range exists in the detection process and the unreachable area is large, and ensures the accuracy of ultrasonic detection results of equipment.
An ultrasonic detection method for fillet welds of a tube seat of a nuclear power station, comprising the following steps of:
preparing a first reference block and a second reference block for placing a fillet weld of a tube seat; the first comparison test block is 1 corresponding to the position of 0 degree of the fillet weld of the placing type pipe seat: 1, test block; the second test block is 1 corresponding to the 90-degree position of the fillet weld of the placing type tube seat: 1, test block;
acquiring size structure data of the first reference block and the second reference block;
selecting a 35-degree probe and a 45-degree probe according to preset ultrasonic detection conditions and the size structure data;
performing ultrasonic detection simulation on the first comparison test block through the 35-degree probe and the 45-degree probe, and recording first detection data;
performing ultrasonic detection simulation on the second comparison test block through the 35-degree probe and the 45-degree probe, and recording second detection data;
generating a welding line detection procedure according to the first detection data and the second detection data;
and controlling the 35-degree probe and the 45-degree probe to carry out ultrasonic detection on the fillet weld of the mounting type tube seat according to the weld detection procedure and acquiring an ultrasonic detection result.
Optionally, the first comparison block comprises a first connection block, a second connection block and a first fillet weld; the end parts of the first connecting block and the second connecting block are vertically connected; the first fillet weld is positioned at the connecting position of the first connecting block and the second connecting block.
Optionally, a plurality of first through holes are arranged on the first fillet weld at intervals in parallel; the central line of the first through hole is perpendicular to the extending direction of the first connecting block and the extending direction of the second connecting block.
Optionally, the diameter of the first through hole is 2 mm; and/or
First shortest distances between the central lines of all the first through holes and the weld joint fusion line are equal; the first shortest distance is smaller than a preset distance value; the weld joint fusion line refers to a connecting line between the first connecting block and the first fillet weld.
Optionally, a first cutting groove parallel to the center line of the first through hole is formed in the root of the first fillet weld; the height of the first cutting groove is 2mm, and the depth of the first cutting groove is 10 mm.
Optionally, the second comparison block comprises a third connection block, a fourth connection block and a second fillet weld; the end parts of the third connecting block and the fourth connecting block are connected, and the end parts of the third connecting block and the fourth connecting block are arranged at a preset angle; the second fillet weld is positioned at the connecting position of the third connecting block and the fourth connecting block.
Optionally, a plurality of second through holes are arranged on the second fillet weld at intervals in parallel; the central line of the second through hole is perpendicular to the extending direction of the third connecting block and the extending direction of the fourth connecting block.
Optionally, the diameter of the second through hole is 2 mm; and/or
All the second through holes are located in the welding seam center of the second fillet weld; the weld center of the second fillet weld refers to a center line of the extending direction of the third connecting block and the extending direction of the fourth connecting block.
Optionally, a second cutting groove parallel to the center line of the second through hole is formed in the root of the second fillet weld; the height of the second cutting groove is 2mm, and the depth of the second cutting groove is 10 mm.
Optionally, the 35 ° probe and the 45 ° probe both have a frequency of 5MHz, and the probe has a wafer size of 4 × 6 mm; the half diffusion angles are all 6 °.
Optionally, the performing an ultrasonic detection simulation on the first comparison block by the 35 ° probe and the 45 ° probe, and recording first detection data includes:
in a half-spread angle range, carrying out partial coverage ultrasonic detection simulation on the first comparison test block through a 35-degree probe, and recording first coverage area data of the first fillet weld, first uncovered area data of the outer surface of the first fillet weld and second uncovered area data of the root of the first fillet weld;
in a half-spread angle range, performing partial coverage ultrasonic detection simulation on the first comparison test block through a 45-degree probe, and recording second coverage area data of the first fillet weld and third uncovered area data of the outer surface of the first fillet weld;
determining a final uncovered area of the first fillet weld according to the first uncovered area data, the second uncovered area data and the third uncovered area data, and detecting the final uncovered area through a magnetic particle detection method to obtain magnetic particle detection data of the final uncovered area;
determining first ultrasonic detection data according to the first coverage area data and the second coverage area data;
generating first detection data of the first fillet weld according to the final uncovered area data and the first ultrasonic detection data.
Optionally, the determining a final uncovered area of the first fillet weld according to the first uncovered area data, the second uncovered area data, and the third uncovered area data includes:
deleting the second uncovered area data;
and the overlapping area compares a first uncovered area corresponding to the first uncovered area data with a third uncovered area corresponding to the third uncovered area data, and records the overlapping area of the first uncovered area and the third uncovered area as a final uncovered area.
Optionally, the performing an ultrasonic detection simulation on the second comparison block by the 35 ° probe and the 45 ° probe, and recording second detection data includes:
within the range of a half diffusion angle, carrying out blind-area-free full-coverage ultrasonic detection simulation on the second comparison test block through a 35-degree probe, and recording third coverage area data of the second fillet weld;
in the range of a half diffusion angle, performing non-blind-area full-coverage ultrasonic detection simulation on the second comparison test block through a 45-degree probe, and recording fourth coverage area data of the second fillet weld;
and generating second detection data of the second fillet weld according to the third coverage area data and the fourth coverage area data.
Optionally, the fillet weld of the placing type pipe seat is a nozzle weld at the connecting position of the auxiliary water supply system of the nuclear power station and the main water supply system of the nuclear power station.
The ultrasonic detection method of the fillet weld of the placed tube seat of the nuclear power station comprises the following steps of firstly preparing a first comparison test block and a second comparison test block of the fillet weld of the placed tube seat; the first comparison test block is 1 corresponding to the position of 0 degree of the fillet weld of the placing type pipe seat: 1, test block; the second test block is 1 corresponding to the 90-degree position of the fillet weld of the placing type tube seat: 1, test block; then, acquiring size structure data of the first reference block and the second reference block; selecting a 35-degree probe and a 45-degree probe according to preset ultrasonic detection conditions and the size structure data; performing ultrasonic detection simulation on the first comparison test block through the 35-degree probe and the 45-degree probe, and recording first detection data; performing ultrasonic detection simulation on the second comparison test block through the 35-degree probe and the 45-degree probe, and recording second detection data; generating a welding line detection procedure according to the first detection data and the second detection data; and controlling the 35-degree probe and the 45-degree probe to carry out ultrasonic detection on the fillet weld of the mounting type tube seat according to the weld detection procedure and acquiring an ultrasonic detection result.
The method comprises the steps of carrying out ultrasonic simulation detection on a first comparison test block and a second comparison test block through a 35-degree probe and a 45-degree probe, then generating a welding line detection procedure according to detection data of the ultrasonic simulation detection, controlling the 35-degree probe and the 45-degree probe to carry out ultrasonic detection on the fillet welding line of the mounting type tube seat according to the welding line detection procedure, and obtaining an ultrasonic detection result; the combination of the 35-degree probe and the 45-degree probe can effectively detect all artificial reflectors on the first comparison test block and the second comparison test block, and no larger unreachable area exists; meanwhile, in the ultrasonic simulation detection and actual ultrasonic detection processes, the signal-to-noise ratio of the ultrasonic signals is larger than 15dB, and structural signals existing in the detection process are weak in strength and easy to eliminate. According to the invention, the accuracy of the ultrasonic detection result finally obtained by carrying out ultrasonic detection on the equipment in service nuclear power station is high, and the safety performance of the equipment in service nuclear power station is effectively ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive labor.
FIG. 1 is a flow chart of a method for ultrasonically detecting fillet welds of a saddle of a nuclear power plant in accordance with an embodiment of the present invention.
Fig. 2 is a schematic diagram of the coverage of a 35 ° probe for performing ultrasonic testing simulation on a first comparison block according to an embodiment of the present invention.
Fig. 3 is a schematic view of the coverage of a 45 ° probe for performing ultrasonic testing simulation on a first comparison block according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of the superposition of probe coverage for ultrasound detection simulation of a first comparison block by a 35 ° probe and a 45 ° probe in an embodiment of the present invention.
Fig. 5 is a schematic diagram of the coverage of the probe for performing ultrasonic testing simulation on the second comparison block by the 35 ° probe according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of the coverage of the probe for performing ultrasonic testing simulation on the second comparison block by the 45 ° probe according to an embodiment of the present invention.
The reference numerals in the specification are as follows:
1. a first reference block; 11. a first connection block; 12. a second connecting block; 13. a first fillet weld; 14. a first through hole; 15. a weld joint fusion line; 16. a first cut groove;
2. a second reference block; 21. a third connecting block; 22. a fourth connecting block; 23. a second fillet weld; 24. a second through hole; 25. a second slot.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The ultrasonic detection method for the fillet weld of the seat of the placed tube in the nuclear power station, disclosed by the invention, comprises the following steps as shown in figure 1:
s10, preparing a first comparison test block 1 and a second comparison test block 2 of the fillet weld of the mounting type pipe seat; the first reference block 1 is 1 corresponding to the position of 0 degree of the fillet weld of the placing type tube seat: 1, test block; the second test block is 1 corresponding to the 90-degree position of the fillet weld of the placing type tube seat: 1, test block; optionally, the fillet weld of the placing type pipe seat is a nozzle weld at the connecting position of the auxiliary water supply system of the nuclear power station and the main water supply system of the nuclear power station; however, in the present invention, the seated tube seat fillet may be any other seated full penetration tube seat fillet having a structure similar to the nozzle fillet described above.
In the invention, firstly, a 1:1 welding test piece (comprising a first comparison test block 1 and a second comparison test block 2) consistent with the material and the internal and external structures of the fillet weld of the detected placing type tube seat needs to be manufactured. Namely, two areas with the most representative structures at the 0-degree position and the 90-degree position of the fillet weld of the placing type tube seat are selected to manufacture the first comparison test block 1 and the second comparison test block 2 (as long as the two areas can achieve good ultrasonic detection effect, other positions can be realized).
Further, as shown in fig. 2 to 4, the first reference block 1 includes a first connection block 11, a second connection block 12, and a first fillet weld 13; the ends of the first connecting block 11 and the second connecting block 12 are vertically connected; the first fillet weld 13 is located at the connection position of the first connection block 11 and the second connection block 12. Understandably, the first and second connection blocks 11 and 12 are actually part structures of pipes of pipe connection positions, and therefore, the first and second connection blocks 11 and 12 are elongated in the cross section shown in fig. 2, and actually, the first and second connection blocks 11 and 12 may have a certain curvature (curvature corresponds to a pipe diameter of a pipe connection position) in the corresponding front-rear direction in fig. 2. The welding seam material and welding process of the first fillet weld 13 and the fillet weld of the placing type tube seat at the 0-degree position are the same. In order to prove that the ultrasonic detection method for fillet weld of the tube seat of the nuclear power station placing type can finally realize covering of the whole first fillet weld 13 of the first comparison test block 1 so as to carry out ultrasonic detection on the first fillet weld; different artificial reflectors may be provided on the first fillet weld 13. The artificial reflector includes a first through hole 14 and a first cut groove 16, etc., which will be mentioned later.
Optionally, a plurality of first through holes 14 are arranged on the first fillet weld 13 at intervals in parallel; the center line of the first through hole 14 is perpendicular to the extending direction of the first connecting block 11 and the extending direction of the second connecting block 12. Understandably, in the embodiment shown in fig. 2, the diameter of each first through hole 14 is 2mm, and the intervals between adjacent first through holes 14 are the same, that is, each first through hole 14 is uniformly arranged on the first fillet weld 13 through the wall thickness of the first reference block 1. In the present invention, the diameter of each first through hole 14 in the first fillet weld 13 may be set to a diameter other than 2mm as required; the diameters of the first through holes 14 may be different or partially different, and the intervals between adjacent first through holes 14 may also be different, but all of the first through holes need to penetrate through the wall thickness of the first comparison test block 1 and be arranged on the first fillet weld 13, so as to determine whether the ultrasonic testing method for the fillet weld of the tube seat of the nuclear power plant in the installed type in the nuclear power plant can finally cover the whole first fillet weld 13 of the first comparison test block 1 in the length direction of the first through holes 14 (i.e. the length direction of the first fillet weld 13).
Further, the first shortest distances between the center lines of all the first through holes 14 and the weld joint fusion line 15 are equal; the first shortest distance is smaller than a preset distance value; the weld line 15 is a connecting line between the first connecting piece 11 and the first fillet weld 13. That is, in the embodiment shown in fig. 2, a connection line between the center lines of the first through holes 14 is parallel to the weld joint fusion line 15, and the distance between the center lines and the weld joint fusion line 15 is a first shortest distance, and the preset distance value should be small, so that after the ultrasonic wave is incident from the right end of the first fillet weld 13 shown in fig. 2, it is determined whether the ultrasonic wave can cover the first through hole 14 which is located at the left end of the first fillet weld 13 and has a small distance from the weld joint fusion line 15; further, it is confirmed whether the ultrasonic testing method for fillet welds of a tube socket of a nuclear power plant according to the present invention can finally cover the entire first fillet weld 13 of the first reference block 1 in the length direction of the weld fusion line 15 (i.e., the depth direction of the first fillet weld 13) shown in fig. 2.
Further, the root of the first fillet weld 13 is provided with a first cut groove 16 parallel to the center line of the first through hole 14; the height of the first slot 16 includes, but is not limited to, 2mm and the depth of the first slot 16 includes, but is not limited to, 10 mm. The width of the first incision 16 can be set according to requirements; in the embodiment shown in fig. 2, after the ultrasonic wave is incident from the right end of the first fillet 13 shown in fig. 2, it is determined whether it can cover the first cut groove 16 located at the root of the first fillet 13; it was further confirmed whether the ultrasonic testing method of the fillet weld of the stem of a nuclear power plant of the present invention can finally cover the entire first fillet weld 13 of the first reference block 1 in the length direction of the weld fusion line 15 shown in fig. 2 (i.e., the depth direction of the first fillet weld 13).
In an embodiment, as shown in fig. 5 and 6, the second comparison block 2 comprises a third connection block 21, a fourth connection block 22 and a second fillet weld 23; the end parts of the third connecting block 21 and the fourth connecting block 22 are connected, and the end parts of the third connecting block 21 and the fourth connecting block 22 are arranged at a preset angle (the preset angle can be set according to requirements, for example, can be greater than or equal to 90 degrees); the second fillet weld 23 is located at the connection position of the third connection block 21 and the fourth connection block 22. Understandably, the third connecting block 21 and the fourth connecting block 22 are actually part of the structure of the pipe at the pipe connecting position, and therefore, as shown in fig. 5, the fourth connecting block 22 will have a certain curvature (curvature corresponding to the pipe diameter at the pipe connecting position); also, although the third connecting block 21 has an elongated shape in the cross section shown in fig. 5, actually, the third connecting block 21 has a certain curvature (curvature corresponding to the pipe diameter at the pipe connecting position) in the corresponding front-rear direction in fig. 5. The welding seam material and welding process of the second fillet weld 23 and the fillet weld of the placing type tube seat at the 90-degree position are the same. In order to prove that the ultrasonic detection method for fillet weld of the tube seat of the nuclear power station placing type can finally cover the whole second fillet weld 23 of the second comparison test block 2 so as to carry out ultrasonic detection on the second fillet weld; different artificial reflectors may be provided on the second fillet weld 23. The artificial reflector includes a second through hole 24 and a second cut groove 25, etc., which will be mentioned later.
Optionally, a plurality of second through holes 24 are arranged on the second fillet weld 23 at intervals in parallel; the center line of the second through hole 24 is perpendicular to both the extending direction of the third connecting block 21 and the extending direction of the fourth connecting block 22. Understandably, in the embodiment shown in fig. 5, the diameter of each second through hole 24 is 2mm, and the intervals between adjacent second through holes 24 are the same, that is, each second through hole 24 is uniformly arranged on the second fillet weld 23 through the wall thickness of the second reference block 2. In the present invention, the diameter of each second through hole 24 in the second fillet weld 23 can be set to be other than 2mm according to requirements; the diameters of the second through holes 24 may be different or partially different, and the intervals between adjacent second through holes 24 may also be different, but all of the second through holes need to penetrate the wall thickness of the second comparison test block 2 and be arranged on the second fillet weld 23, so as to determine whether the ultrasonic testing method for the fillet weld of the tube seat of the nuclear power plant placing type tube seat of the invention can finally cover the whole second fillet weld 23 of the second comparison test block 2 in the length direction of the second through hole 24 (i.e. the length direction of the second fillet weld 23).
Optionally, all the second through holes 24 are located on the weld center of the second fillet weld 23; the weld center of the second fillet weld 23 is a center line of the extending direction of the third connecting piece 21 and the extending direction of the fourth connecting piece 22. That is, in the embodiment shown in fig. 5, a connecting line between the center lines of the second through holes 24 coincides with the weld center of the second fillet weld 23, so that after the ultrasonic wave is incident from the right end of the second fillet weld 23 shown in fig. 5, it is determined whether it can cover the second through hole 24 located at the weld center of the second fillet weld 23; further, it is confirmed whether the ultrasonic testing method for fillet welds of a tube seat of a nuclear power plant according to the present invention can finally cover the entire second fillet weld 23 of the second comparison block 2 in the length direction of the weld fusion line 15 (i.e., the depth direction of the second fillet weld 23) shown in fig. 5.
In one embodiment, the root of the second fillet weld 23 is provided with a second cutting groove 25 parallel to the center line of the second through hole 24; the second incision 25 has a height of 2mm and a depth of 10 mm. The width of the second incision 25 can be set according to requirements; in the embodiment shown in fig. 5, after the ultrasonic wave is incident from the right end of the second fillet weld 23 shown in fig. 5, it is determined whether it can cover the second cut groove 25 at the root of the second fillet weld 23; it was further confirmed whether the ultrasonic testing method for fillet welds of tube seats of a nuclear power plant according to the present invention can finally cover the entire second fillet weld 23 of the second comparison block 2 in the length direction of the weld center of the second fillet weld 23 (i.e., the depth direction of the second fillet weld 23) shown in fig. 5.
Understandably, the first comparison test block corresponds to the position of 0 degree of the fillet weld of the placing type tube seat, namely the structure of the first comparison test block is the same as that of the part of the placing type tube seat containing the fillet weld thereof in the axial direction; the second comparison test block corresponds to the position of 90 degrees of the fillet weld of the placing type pipe seat, namely the structure of the second comparison test block is the same as that of the part of the placing type pipe seat which is vertical to the axial direction and comprises the fillet weld in the circumferential direction; therefore, the first fillet weld and the second fillet weld are actually the same placing type pipe seat fillet weld.
S20, acquiring size structure data of the first comparison test block 1 and the second comparison test block 2; the size structure data of the first comparison test block 1 and the second comparison test block 2 are manufactured one by one according to the structures at two positions of 0-degree position and 90-degree position of the fillet weld of the placing type tube seat, and after the first comparison test block 1 and the second comparison test block 2 are manufactured, the size structure data can be stored in a database so as to be convenient to call from the database at any time when needed.
S30, selecting a 35-degree probe and a 45-degree probe according to preset ultrasonic detection conditions and the size structure data; wherein, the preset ultrasonic detection conditions comprise: under the condition that accessibility and geometric structure conditions allow, the ultrasonic detection wave can cover the whole welding seam area as much as possible, and the welding seam area comprises a welding seam body and heat affected zones on two sides of the welding seam body. Wherein, in the fillet weld with the wall thickness less than or equal to 30mm, the heat affected zone is 5mm on each side of the weld; in fillet welds with a wall thickness greater than 30mm, the heat affected zones are 10mm on each side of the weld. Understandably, in the present invention, it is necessary to select the angle of refraction according to the geometric size and the configuration of the first fillet weld 13 and the second fillet weld 23. In one embodiment, the angle selection of the angle probe can be determined by testing process experiments, for example, the actual testing effect of the 60 ° probe on the first and second reference blocks 1 and 2 in the present invention is not good: firstly, the sound beam of the probe with 60 degrees is diffused too obviously, so that after the sound beam is reflected once by the bottom surface of the first comparison test block 1 or the second comparison test block 2, the echo energy of an artificial reflector (namely the defect of artificial setting) is low, and the detection signal is difficult to identify; secondly, the structure reflection signal in the detection process is too strong, so that the judgment of a defect signal is interfered; and, after selecting the 35 ° probe and the 45 ° probe according to the preset ultrasonic detection conditions and the dimensional structure data in this step, the 35 ° probe and the 45 ° probe can clearly find the signals of the root artificial groove (the 60 ° probe can be mainly used for detecting the weld root defects), which indicates that the expected detection area of the 60 ° probe is effectively covered by the 35 ° probe and the 45 ° probe. Therefore, the 60 ° probe is not adopted in the present invention because the actual detection effect of the 60 ° probe on the first reference block 1 and the second reference block 2 in the present invention is not good. Preferably, according to preset ultrasonic detection conditions and the size structure data, determining that the frequencies of the 35-degree probe and the 45-degree probe are both 5MHz, and the wafer sizes of the probes are both 4 x 6 mm; the half diffusion angles are all 6 °.
And S40, performing ultrasonic detection simulation on the first reference block 1 through the 35-degree probe and the 45-degree probe, and recording first detection data.
Optionally, the step S40 specifically includes:
in a half-spread angle range, performing partial coverage ultrasonic detection simulation on the first reference block 1 through a 35-degree probe, and recording first coverage area data of the first fillet weld 13, first uncovered area data of the outer surface of the first fillet weld 13 and second uncovered area data of the root of the first fillet weld 13; as shown in fig. 2, in the schematic diagram of the probe coverage range of the ultrasonic detection simulation of the 35 ° probe on the first reference block 1, it can be seen that, in the first reference block 1 corresponding to the 0 ° position of the seated stem fillet weld, within the half-spread angle range of the 35 ° probe, a small first uncovered area with a depth of about 1mm exists at the position of the residual height of the outer surface of the first fillet weld 13 (i.e., the top of the first fillet weld 13 shown in fig. 2), and at this time, first coverage area data of the first fillet weld 13 (weld detection data of the ultrasonic wave of the 35 ° probe on the first coverage area of the first fillet weld 13) is recorded; acquiring first uncovered area data (including the position, area and the like of a first uncovered area) of the outer surface of the first fillet weld 13; meanwhile, as shown in fig. 2, in the first reference block 1 corresponding to the 90 ° position of the seated tube seat fillet, a second uncovered area having a depth of about 6mm exists at the root of the first fillet 13 (i.e., at the bottom of the first fillet 13 shown in fig. 2), and at this time, second uncovered area data (including the position, area, etc. of the second uncovered area) at the root of the first fillet 13 is obtained.
In a half-spread angle range, performing partial coverage ultrasonic detection simulation on the first reference block 1 through a 45-degree probe, and recording second coverage area data of the first fillet weld 13 and third uncovered area data of the outer surface of the first fillet weld 13; as shown in fig. 3, in the schematic diagram of the probe coverage range of the ultrasonic detection simulation of the 45 ° probe on the first reference block 1, it can be seen that, in the first reference block 1 corresponding to the 0 ° position of the seated stem fillet weld, the 45 ° probe can completely cover all root regions of the first fillet weld 13 within the half-spread angle range of the 45 ° probe, but a third uncovered region of the outer surface of the first fillet weld 13 is greater than the 35 ° probe, and at this time, second coverage region data of the first fillet weld 13 (weld detection data of the second coverage region of the first fillet weld 13 by the ultrasonic wave of the 45 ° probe) is recorded; third uncovered area data (including the location and area of the third uncovered area, etc.) of the outer surface of the first fillet weld 13 is acquired.
Determining a final uncovered area of the first fillet weld 13 according to the first uncovered area data, the second uncovered area data and the third uncovered area data, and detecting the final uncovered area through a magnetic particle detection method to obtain magnetic particle detection data of the final uncovered area; optionally, the determining a final uncovered area of the first fillet weld 13 according to the first uncovered area data, the second uncovered area data and the third uncovered area data includes:
deleting the second uncovered area data; wherein a second uncovered area corresponding to the second uncovered area data is covered by a second covered area corresponding to the second covered area data; that is, combining the uncovered areas of the 35 ° probe and the 45 ° probe in fig. 2 and 3, it can be seen that in the half-spread angle range of the 35 ° probe and the 45 ° probe, the first fillet weld 13 at the 0 ° position of the seated stem fillet weld has only a small first uncovered area (i.e., the final uncovered area) with a depth of about 1mm at the outer surface residual height; therefore, the second uncovered area (located at the root of the first fillet 13) to which the second uncovered area data corresponds has been substantially covered by the second covered area of the 45 ° probe (i.e., the second covered area corresponding to the second covered area data), and therefore, the second uncovered area data can be deleted.
Comparing a first uncovered area corresponding to the first uncovered area data with a third uncovered area corresponding to the third uncovered area data, and recording the overlapped area of the first uncovered area and the third uncovered area as a final uncovered area. That is, as shown in fig. 4, only the overlapping region of the first uncovered region and the third uncovered region is not covered by the ultrasonic waves within the half spread angle range of the 35 ° probe and the 45 ° probe, and therefore, the overlapping region will be recorded as the final uncovered region.
That is, combining the uncovered areas of the 35 ° probe and the 45 ° probe in fig. 2 and fig. 3, it can be seen that, within the half-spread angle range of the 35 ° probe and the 45 ° probe, the first fillet weld 13 at the 0 ° position of the seated stem fillet weld has only a small first uncovered area (i.e. the final uncovered area) with a depth of about 1mm at the position of the outer surface, and at this time, the final uncovered area can be subjected to supplementary inspection by using magnetic particle inspection to obtain the final uncovered area data (including the weld inspection data measured by the magnetic particle inspection, etc.) of the final uncovered area.
Determining first ultrasonic detection data according to the first coverage area data and the second coverage area data; that is, the first ultrasonic detection data includes the ultrasonic detection result of the artificial reflector or other parts of the ultrasonic-covered region of the first fillet weld 13; and the first ultrasonic detection data is determined according to the first coverage area data measured by the 35 DEG probe and the second coverage area data measured by the 45 DEG probe.
Generating first detection data of the first fillet weld 13 according to the final uncovered area data and the first ultrasonic detection data. That is, the first detection data includes the weld detection results and the weld detection modes for the artificial reflectors and the like in all the portions of the first fillet weld 13; and the first detection data is determined by the first coverage area data measured by the 35-degree probe, the second coverage area data measured by the 45-degree probe and weld joint detection data obtained by performing supplementary detection on the final uncovered area by a magnetic particle detection method.
And S50, performing ultrasonic detection simulation on the second reference block 2 through the 35-degree probe and the 45-degree probe, and recording second detection data.
Optionally, the step S50 includes:
within the range of a half diffusion angle, carrying out non-blind-area full-coverage ultrasonic detection simulation on the second reference block 2 through a 35-degree probe, and recording third coverage area data of the second fillet weld 23; as shown in fig. 5, in the schematic view of the probe coverage area of the 35 ° probe for performing the ultrasonic detection simulation on the second reference block 2, it can be seen that, in the second reference block 2 corresponding to the 90 ° position of the installed base fillet weld, no uncovered area (i.e., no blind area) exists from the outer surface of the second fillet weld 23 to the root in the half-diffusion angle range of the 45 ° probe, at this time, only the third coverage area data of the root of the second fillet weld 23 needs to be obtained (the third coverage area data refers to the weld detection data of the third coverage area of the second fillet weld 23 by the ultrasonic wave of the 35 ° probe, i.e., the weld detection data of the entire second fillet weld 23).
In the range of a half diffusion angle, performing non-blind-area full-coverage ultrasonic detection simulation on the second reference block 2 through a 45-degree probe, and recording fourth coverage area data of the second fillet weld 23; as shown in fig. 6, in the schematic diagram of the probe coverage area of the 45 ° probe for performing the ultrasonic detection simulation on the second reference block 2, it can be seen that, in the second reference block 2 corresponding to the 90 ° position of the installed base fillet weld, no uncovered area (i.e., no blind area) exists from the outer surface of the second fillet weld 23 to the root in the half-diffusion angle range of the 45 ° probe, and at this time, only the fourth coverage area data of the root of the second fillet weld 23 needs to be obtained (the weld detection data of the fourth coverage area of the second fillet weld 23 by the ultrasonic wave of the 35 ° probe for the fourth coverage area of the second fillet weld 23, i.e., the weld detection data of the entire second fillet weld 23).
And generating second detection data of the second fillet weld 23 according to the third coverage area data and the fourth coverage area data. That is, the second detection data includes the weld detection results and the weld detection modes for the artificial reflectors and the like in all the portions of the first fillet weld 13; and the second detection data is determined by the third coverage area data measured by the 35 DEG probe and the fourth coverage area data measured by the 45 DEG probe.
It should be understood that, in the present invention, the sequence between step S40 and step S50 is not limited, for example, step S40 or step S50 may be executed first, or steps S40 and S50 may be executed at the same time.
S60, generating a weld detection process based on the first detection data and the second detection data; that is, in this step, according to the weld detection result and the weld detection manner included in the first detection data and the second detection data, the detection process for the first comparison block 1 and the second comparison block 2 can be determined, and further, the weld detection process that can achieve a better detection effect on the fillet weld of the entire seated stem can be determined. The ultrasonic detection is carried out according to the welding seam detection procedure, and understandably, the welding seam detection procedure inevitably comprises an ultrasonic detection procedure of a 35-degree probe and a 45-degree probe for the fillet welding seam of the placing type tube seat; of course, the procedure of performing the supplementary inspection on the final uncovered area with a smaller area by the magnetic particle inspection method described in the above embodiment may also be included.
And S70, controlling the 35-degree probe and the 45-degree probe to carry out ultrasonic detection on the fillet weld of the mounting type tube seat according to the weld detection procedure, and acquiring an ultrasonic detection result. That is, in the step, firstly, the 35-degree probe and the 45-degree probe are controlled to carry out an ultrasonic detection process on the fillet weld of the mounting type tube seat and obtain an ultrasonic detection result; in the method, after the ultrasonic detection result is obtained, the final uncovered area with a smaller area can be subjected to supplementary detection through a magnetic particle detection method, so that the magnetic particle detection result is obtained, and the final weld joint detection result of the fillet weld of the mounting type tube seat is determined according to the ultrasonic detection result and the magnetic particle detection result.
The method comprises the steps of carrying out ultrasonic simulation detection on a first reference block 1 and a second reference block 2 through a 35-degree probe and a 45-degree probe, then generating a welding line detection procedure according to detection data of the ultrasonic simulation detection, controlling the 35-degree probe and the 45-degree probe to carry out ultrasonic detection on the fillet welding line of the mounted tube seat according to the welding line detection procedure, and obtaining an ultrasonic detection result; the combination of the 35-degree probe and the 45-degree probe can effectively detect all artificial reflectors on the first comparison test block 1 and the second comparison test block 2, and no larger unreachable area exists; meanwhile, in the ultrasonic simulation detection and actual ultrasonic detection processes, the signal-to-noise ratio of the ultrasonic signals is larger than 15dB, and structural signals existing in the detection process are weak in strength and easy to eliminate. According to the invention, the accuracy of the ultrasonic detection result finally obtained by carrying out ultrasonic detection on the equipment in service nuclear power station is high, and the safety performance of the equipment in service nuclear power station is effectively ensured.
The ultrasonic detection method for the fillet weld of the tube seat of the nuclear power station can effectively detect the ASG/ARE nozzle weld (the nozzle weld at the connecting position of the auxiliary water supply system of the nuclear power station and the main water supply system of the nuclear power station) and can meet the preset ultrasonic detection condition while ensuring the safety of equipment of the nuclear power station. The ultrasonic detection method is already applied to ultrasonic detection of the ASG/ARE nozzle welding line of six units of a certain nuclear power base.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (14)
1. An ultrasonic detection method for fillet welds of a tube seat of a nuclear power station, which is characterized by comprising the following steps:
preparing a first reference block and a second reference block for placing a fillet weld of a tube seat; the first comparison test block is 1 corresponding to the position of 0 degree of the fillet weld of the placing type pipe seat: 1, test block; the second test block is 1 corresponding to the 90-degree position of the fillet weld of the placing type tube seat: 1, test block;
acquiring size structure data of the first reference block and the second reference block;
selecting a 35-degree probe and a 45-degree probe according to preset ultrasonic detection conditions and the size structure data;
performing ultrasonic detection simulation on the first comparison test block through the 35-degree probe and the 45-degree probe, and recording first detection data;
performing ultrasonic detection simulation on the second comparison test block through the 35-degree probe and the 45-degree probe, and recording second detection data;
generating a welding line detection procedure according to the first detection data and the second detection data;
and controlling the 35-degree probe and the 45-degree probe to carry out ultrasonic detection on the fillet weld of the mounting type tube seat according to the weld detection procedure and acquiring an ultrasonic detection result.
2. The ultrasonic testing method for fillet weld of tube seat in nuclear power plant as claimed in claim 1, wherein the first comparison block comprises a first connection block, a second connection block and a first fillet weld; the end parts of the first connecting block and the second connecting block are vertically connected; the first fillet weld is positioned at the connecting position of the first connecting block and the second connecting block.
3. The ultrasonic testing method for fillet weld of tube seat in nuclear power plant as claimed in claim 2, wherein the first fillet weld is provided with a plurality of first through holes in parallel and at intervals; the central line of the first through hole is perpendicular to the extending direction of the first connecting block and the extending direction of the second connecting block.
4. The ultrasonic testing method for fillet weld of tube seat in nuclear power plant as claimed in claim 3, wherein the diameter of said first through hole is 2 mm; and/or
First shortest distances between the central lines of all the first through holes and the weld joint fusion line are equal; the first shortest distance is smaller than a preset distance value; the weld joint fusion line refers to a connecting line between the first connecting block and the first fillet weld.
5. The ultrasonic testing method for fillet weld of tube seat in nuclear power plant as claimed in claim 3, wherein the root of the first fillet weld is provided with a first notch parallel to the center line of the first through hole; the height of the first cutting groove is 2mm, and the depth of the first cutting groove is 10 mm.
6. The ultrasonic testing method of the fillet weld of the saddle of the nuclear power plant as recited in claim 1, wherein the second comparison block comprises a third connecting block, a fourth connecting block, and a second fillet weld; the end parts of the third connecting block and the fourth connecting block are connected, and the end parts of the third connecting block and the fourth connecting block are arranged at a preset angle; the second fillet weld is positioned at the connecting position of the third connecting block and the fourth connecting block.
7. The ultrasonic testing method for fillet weld of tube seat in nuclear power plant as claimed in claim 6, wherein a plurality of second through holes are arranged in parallel and at intervals on the second fillet weld; the central line of the second through hole is perpendicular to the extending direction of the third connecting block and the extending direction of the fourth connecting block.
8. The ultrasonic testing method for fillet weld of tube seat in nuclear power plant as claimed in claim 7, wherein the diameter of said second through hole is 2 mm; and/or
All the second through holes are located in the welding seam center of the second fillet weld; the weld center of the second fillet weld refers to a center line of the extending direction of the third connecting block and the extending direction of the fourth connecting block.
9. The ultrasonic testing method of the fillet weld of the saddle of the nuclear power plant as recited in claim 7, wherein a second notch parallel to the center line of the second through hole is formed at the root of the second fillet weld; the height of the second cutting groove is 2mm, and the depth of the second cutting groove is 10 mm.
10. The ultrasonic testing method for fillet weld of tube seat in nuclear power plant as claimed in claim 1, wherein the 35 ° probe and the 45 ° probe both have a frequency of 5MHz, and the probes have a wafer size of 4 x 6 mm; the half diffusion angles are all 6 °.
11. The method of ultrasonic testing of a seat fillet weld of a nuclear power plant as claimed in claim 10, wherein said simulating the ultrasonic testing of said first comparison block by said 35 ° probe and said 45 ° probe and recording first test data comprises:
in a half-spread angle range, carrying out partial coverage ultrasonic detection simulation on the first comparison test block through a 35-degree probe, and recording first coverage area data of the first fillet weld, first uncovered area data of the outer surface of the first fillet weld and second uncovered area data of the root of the first fillet weld;
in a half-spread angle range, performing partial coverage ultrasonic detection simulation on the first comparison test block through a 45-degree probe, and recording second coverage area data of the first fillet weld and third uncovered area data of the outer surface of the first fillet weld;
determining a final uncovered area of the first fillet weld according to the first uncovered area data, the second uncovered area data and the third uncovered area data, and detecting the final uncovered area through a magnetic particle detection method to obtain magnetic particle detection data of the final uncovered area;
determining first ultrasonic detection data according to the first coverage area data and the second coverage area data;
generating first detection data of the first fillet weld according to the final uncovered area data and the first ultrasonic detection data.
12. The method of ultrasonic testing of a nuclear power plant emplaced header fillet weld of claim 11, wherein determining a final uncovered area of the first fillet weld from the first uncovered area data, the second uncovered area data, and the third uncovered area data comprises:
deleting the second uncovered area data;
and the overlapping area compares a first uncovered area corresponding to the first uncovered area data with a third uncovered area corresponding to the third uncovered area data, and records the overlapping area of the first uncovered area and the third uncovered area as a final uncovered area.
13. The ultrasonic testing method for fillet weld of seat in nuclear power plant as claimed in claim 10, wherein said simulating the ultrasonic testing of said second comparative block by said 35 ° probe and said 45 ° probe and recording the second testing data comprises:
within the range of a half diffusion angle, carrying out blind-area-free full-coverage ultrasonic detection simulation on the second comparison test block through a 35-degree probe, and recording third coverage area data of the second fillet weld;
in the range of a half diffusion angle, performing non-blind-area full-coverage ultrasonic detection simulation on the second comparison test block through a 45-degree probe, and recording fourth coverage area data of the second fillet weld;
and generating second detection data of the second fillet weld according to the third coverage area data and the fourth coverage area data.
14. The ultrasonic testing method for the fillet weld of the saddle-type pipe seat of the nuclear power plant as set forth in claim 1, wherein the fillet weld of the saddle-type pipe seat is a nozzle weld at a pipe connection position between the secondary water supply system of the nuclear power plant and the primary water supply system of the nuclear power plant.
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